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Mild hypoxia adversely impacts human vestibular function
Max A Teaford1,2,3, Kyle A Kainec4,5, Kyle A Pettijohn5
1Department of Psychology, University of Tennessee at Chattanooga, Chattanooga, TN, USA. max-teaford@utc.edu.
Scientific Reports
|November 3, 2025
Summary
Mild hypoxia, like that experienced at 2400m, significantly impairs human vestibular function. This study shows increased vestibular thresholds, suggesting the vestibular system signals the onset of hypoxia.
Area of Science:
- Aerospace Medicine
- Human Physiology
- Neuroscience
Background:
- Hypoxia above 3000m adversely affects sensory function.
- Limited research exists on hypoxia's impact on vestibular function below 2400m.
- The vestibular system's high metabolic needs suggest vulnerability to hypoxia.
Purpose of the Study:
- To investigate the impact of mild hypoxia on human vestibular thresholds.
- To assess vestibular function at simulated altitudes of 2400m (8000 ft).
- To determine if vestibular changes correlate with arterial oxygen saturation (SpO2).
Main Methods:
- Participants breathed air with 15.4% O2 to simulate 2400m altitude.
- Measured earth-vertical translation thresholds.
- Monitored arterial oxygen saturation (SpO2).
Main Results:
- Average vestibular thresholds increased by over 20% under hypoxic conditions.
- Threshold changes negatively correlated with SpO2.
- Mild hypoxia significantly impacts vestibular function.
Conclusions:
- Vestibular system changes may serve as an early indicator of hypoxia.
- Findings highlight the importance of vestibular function in mild hypoxic environments.
- Further research is needed on vestibular adaptation to altitude.
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